What are some best practices for efficiently handling and processing data from files in PHP?

When handling and processing data from files in PHP, it is important to use efficient methods to avoid performance issues. One best practice is to read and process the file line by line instead of loading the entire file into memory at once. This can help conserve memory and improve processing speed.

// Open the file for reading
$handle = fopen("data.txt", "r");

// Process the file line by line
while (($line = fgets($handle)) !== false) {
    // Process each line of data here
    echo $line;
}

// Close the file handle
fclose($handle);